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PubMed Background PubMed (pubmed.gov) ® • PubMed is a database developed by the National Center for Biotechnology Information (NCBI) at the National Library of Medicine (NLM) available on the Web. • PubMed is one of several databases under NCBI’s Entrez retrieval system. • PubMed, a database of over 14 million bibliographic citations back to the 1950s provides ® access, free of charge, to MEDLINE . • PubMed also has links to the full-text of articles at participating publishers’ Web sites, biological data, sequence centers, etc. from third parties. • PubMed provides links to the integrated molecular biology databases maintained by NCBI. These databases contain: DNA and protein sequences, genome mapping data, and 3-D protein structures, aligned sequences from populations, and the Online Mendelian Inheritance in Man (OMIM). Interrelationships between Entrez Databases • Links between MEDLINE records and sequence records make it easy to find MEDLINE abstracts associated with sequence records and vice versa. • The following diagram illustrates the relationships between the information resources in Entrez: 35 PubMed Background PubMed Publisher Supplied Citations • These are citations that are supplied electronically by publishers directly to PubMed. The citations are then forwarded to NLM’s Index Section to be processed. (Not all citations are supplied electronically). • Citations received electronically have the status tag: [PubMed - as supplied by publisher]. Sample PubMed citation that was submitted electronically but processing has not yet begun: Notice the [PubMed – as supplied by publisher] status tag. In Process • These citations are being reviewed for inclusion in MEDLINE and, if in scope, subsequently ® are indexed with MeSH vocabulary. In addition the bibliographic data in these records is being checked for accuracy. • In process records carry the status tag: [PubMed – in process]. • In process records are added to PubMed Tuesday-Saturday. Sample of an In Process citation in PubMed: Notice the [PubMed – in process] status tag. 36 PubMed Background PubMed MEDLINE • This is NLM’s premier bibliographic database covering the fields of medicine, nursing, dentistry, veterinary medicine, the health care system, the preclinical sciences, and other areas of the life sciences. • MEDLINE records contain bibliographic citations and in most cases author abstracts from more than 4,600 biomedical journals published in the United States and 70 other countries. • Although most records are from English-language sources or have English abstracts. • Approximately 76% of MEDLINE records include abstracts as they appear in the journal. • MEDLINE has over 12 million records from 1966 to the present. • MEDLINE records are added to PubMed Tuesday-Saturday. • After MeSH terms (NLM’s controlled vocabulary terms) and other indexing terms are added, the in process citations graduate to MEDLINE records. These “completed” records have also been checked for bibliographic accuracy. • Fully indexed MEDLINE records carry the status tag [PubMed – indexed for MEDLINE]. Sample MEDLINE citation in PubMed Notice the [PubMed – indexed for MEDLINE] status tag. 37 PubMed Background PubMed OLDMEDLINE CITATIONS • These citations are to articles from international biomedical journals covering the fields of medicine, preclinical sciences, and allied health sciences. • The approximately 1.5 million OLDMEDLINE citations, which do not include abstracts, were originally printed in hardcopy indexes published from 1953 through 1965. • OLDMEDLINE citations have been created using standards that are different from the data entry standards for MEDLINE records. There are also variations among OLDMEDLINE citations in the data fields present as well as in their format, depending on the original source from which the citations were obtained. • OLDMEDLINE citations lack the accumulated changes and improvements that have been made to data in MEDLINE during annual maintenance. • OLDMEDLINE records carry the status tag [PubMed – OLDMEDLINE for Pre1966] Sample OLDMEDLINE citation in PubMed 38
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